These were acquired years ago with a box of Buick dynaflow parts. Going thru parts book illustrations, they look like "reverse clutch pressure plate" for 1958-59 triple turbine tranny's, Group 4.189 #1180224. They are just slightly over 6" OD. Anyone familiar with these tranny's and can confirm by sight? I'll also be asking the question over on the BCA sight once it's back up. Thanks! John
